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<BODY><H2><a href="../contents.htm">Tcl8.6.11/Tk8.6.11 Documentation</a> <small>&gt;</small> <a href="contents.htm">Tcl C API</a> <small>&gt;</small> AllowExc</H2>
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<H3><A NAME="M2">NAME</A></H3>
Tcl_AllowExceptions &mdash; allow all exceptions in next script evaluation
<H3><A NAME="M3">SYNOPSIS</A></H3>
<B>#include &lt;tcl.h&gt;</B><BR>
<B>Tcl_AllowExceptions</B>(<I>interp</I>)<BR>
<H3><A NAME="M4">ARGUMENTS</A></H3>
<DL class="arguments">
<DT><A HREF="../TclLib/Interp.htm">Tcl_Interp</A> <B>*interp</B> (in)<DD>
Interpreter in which script will be evaluated.
<P></DL>
<H3><A NAME="M5">DESCRIPTION</A></H3>
If a script is evaluated at top-level (i.e. no other scripts are
pending evaluation when the script is invoked), and if the script
terminates with a completion code other than <B><A HREF="../TclCmd/catch.htm">TCL_OK</A></B>, <B><A HREF="../TclCmd/catch.htm">TCL_ERROR</A></B>
or <B><A HREF="../TclCmd/catch.htm">TCL_RETURN</A></B>, then Tcl normally converts this into a <B><A HREF="../TclCmd/catch.htm">TCL_ERROR</A></B>
return with an appropriate message.  The particular script
evaluation procedures of Tcl that act in the manner are
<B><A HREF="../TclLib/Eval.htm">Tcl_EvalObjEx</A></B>, <B><A HREF="../TclLib/Eval.htm">Tcl_EvalObjv</A></B>, <B><A HREF="../TclLib/Eval.htm">Tcl_Eval</A></B>, <B><A HREF="../TclLib/Eval.htm">Tcl_EvalEx</A></B>,
<B><A HREF="../TclLib/Eval.htm">Tcl_GlobalEval</A></B>, <B><A HREF="../TclLib/Eval.htm">Tcl_GlobalEvalObj</A></B>, <B><A HREF="../TclLib/Eval.htm">Tcl_VarEval</A></B> and
<B><A HREF="../TclLib/Eval.htm">Tcl_VarEvalVA</A></B>.
<P>
However, if <B>Tcl_AllowExceptions</B> is invoked immediately before
calling one of those a procedures, then arbitrary completion
codes are permitted from the script, and they are returned without
modification.
This is useful in cases where the caller can deal with exceptions
such as <B><A HREF="../TclCmd/catch.htm">TCL_BREAK</A></B> or <B><A HREF="../TclCmd/catch.htm">TCL_CONTINUE</A></B> in a meaningful way.

<H3><A NAME="M6">KEYWORDS</A></H3>
<A href="../Keywords/C.htm#continue">continue</A>, <A href="../Keywords/B.htm#break">break</A>, <A href="../Keywords/E.htm#exception">exception</A>, <A href="../Keywords/I.htm#interpreter">interpreter</A>
<div class="copy">Copyright &copy; 1989-1993 The Regents of the University of California.
<BR>Copyright &copy; 1994-1996 Sun Microsystems, Inc.
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